Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
The burner door assembly should already be removed from previous test

Observation:

Visually inspect the burner for blockages / restrictions
and good overall condition.
Note.
1. Do NOT reassemble the appliance if the visual inspections are satisfactory.
2. Always examine any seals or gaskets, replacing where necessary.